There are a lot of resources on the internet about shopping rewards programs. We've tried to summarize them here so you can quickly find what you're looking for.
If you aren't able to find what you're looking for here, or anywhere else online, then you can also find information about the particular rewards programs you are a part of, by asking the credit card company, retailer, airline or car rental company for their terms and conditions. If you're finding the terms and conditions are a bit hard to read (since they are legal documents) you can call their customer service line and just ask them your question directly.
